The term 'Estrogen or Testosterone' is a combination of two words: 'STEROID' and 'HORMONE'. STEROID is a seven-letter word that refers to a type of organic compound that contains four rings of carbon atoms. HORMONE is also a seven-letter word that refers to a chemical messenger produced by the endocrine glands that regulate various bodily functions. Estrogen and Testosterone are two types of hormones that are produced in the body and play an important role in the development and maintenance of reproductive organs and secondary sexual characteristics.